2015-03-02 - v0.2.1
  * Added support for loading metadata from byte-array data buffers.
  * Split gexiv2 FFI declarations off into separate gexiv2-sys crate dependency.

2015-03-01 - v0.2.0
  * The "get_tag_type" function now returns an item from an enum of data types.
  * Some methods that used to return magic numbers on error now return Options.
  * The "get_mime_type" method is renamed "get_media_type" for correctness.
  * Custom Rational type replaced by common num::rational::Ratio.

2015-02-25 - v0.1.0
  * First development release.
  * Added ability to set multiple string values for a tag.
  * Fixed array terminator bug when getting list of Exif tags.

2015-02-21 - v0.1.0-pre
  * First preview release to solicit code review and feedback.
